+++ /dev/null
-// INetAddress.java -- An Internet Protocol (IP) address.
-
-/* Copyright (C) 1998, 1999, 2000 Free Software Foundation
-
- This file is part of libgcj.
-
-This software is copyrighted work licensed under the terms of the
-Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
-details. */
-
-package java.net;
-import java.io.ObjectInputStream;
-import java.io.ObjectOutputStream;
-import java.io.IOException;
-
-/**
- * @author Per Bothner
- * @date January 6, 1999.
- */
-
-/*
- * Written using on-line Java Platform 1.2 API Specification, as well
- * as "The Java Class Libraries", 2nd edition (Addison-Wesley, 1998).
- * (The latter turns out to have some errors ...)
- * Status: Believed complete and correct.
- */
-
-public final class InetAddress implements java.io.Serializable
-{
- // The Serialized Form specifies that an int 'address' is saved/restored.
- // This class uses a byte array internally so we'll just do the conversion
- // at serialization time and leave the rest of the algorithm as is.
- private int address;
- transient byte[] addr;
- String hostName;
- // The field 'family' seems to be the AF_ value.
- // FIXME: Much of the code in the other java.net classes does not make
- // use of this family field. A better implementation would be to make
- // use of getaddrinfo() and have other methods just check the family
- // field rather than examining the length of the address each time.
- int family;
- private static final long serialVersionUID = 3286316764910316507L;
-
- private void readObject(ObjectInputStream ois)
- throws IOException, ClassNotFoundException
- {
- ois.defaultReadObject();
- addr = new byte[4];
- addr[3] = (byte) address;
- for (int i = 2; i >= 0; --i)
- addr[i] = (byte) (address >>= 8);
- // Ignore family from serialized data. Since the saved address is 32 bits
- // the deserialized object will have an IPv4 address i.e. AF_INET family.
- // FIXME: An alternative is to call the aton method on the deserialized
- // hostname to get a new address. The Serialized Form doc is silent
- // on how these fields are used.
- family = getFamily (addr);
- }
-
- private void writeObject(ObjectOutputStream oos) throws IOException
- {
- // Build a 32 bit address from the last 4 bytes of a 4 byte IPv4 address
- // or a 16 byte IPv6 address.
- int len = addr.length;
- int i = len - 4;
- for (; i < len; i++)
- address = address << 8 | (((int) addr[i]) & 0xFF);
- oos.defaultWriteObject();
- }
-
- private static native int getFamily (byte[] address);
-
- InetAddress (byte[] address, String hostname)
- {
- addr = address;
- hostName = hostname;
- if (address != null)
- family = getFamily (address);
- }
-
- public boolean isMulticastAddress ()
- {
- int len = addr.length;
- if (len == 4)
- return (addr[0] & 0xF0) == 0xE0;
- if (len == 16)
- return addr[0] == (byte) 0xFF;
- return false;
- }
-
- public String getHostName ()
- {
- if (hostName == null)
- lookup (null, this, false);
- return hostName;
- }
-
- public byte[] getAddress ()
- {
- // An experiment shows that JDK1.2 returns a different byte array each
- // time. This makes sense, in terms of security.
- return (byte[]) addr.clone();
- }
-
- /* Helper function due to a CNI limitation. */
- private static InetAddress[] allocArray (int count)
- {
- return new InetAddress[count];
- }
-
- /* Helper function due to a CNI limitation. */
- private static SecurityException checkConnect (String hostname)
- {
- SecurityManager s = System.getSecurityManager();
- if (s == null)
- return null;
- try
- {
- s.checkConnect(hostname, -1);
- return null;
- }
- catch (SecurityException ex)
- {
- return ex;
- }
- }
-
- public String getHostAddress ()
- {
- StringBuffer sbuf = new StringBuffer(40);
- int len = addr.length;
- int i = 0;
- if (len == 16)
- { // An IPv6 address.
- for (; ; i += 2)
- {
- if (i >= 16)
- return sbuf.toString();
- int x = ((addr[i] & 0xFF) << 8) | (addr[i+1] & 0xFF);
- boolean empty = sbuf.length() == 0;
- if (empty)
- {
- if (i == 10 && x == 0xFFFF)
- { // IPv4-mapped IPv6 address.
- sbuf.append(":FFFF:");
- break; // Continue as IPv4 address;
- }
- else if (i == 12)
- { // IPv4-compatible IPv6 address.
- sbuf.append(':');
- break; // Continue as IPv4 address.
- }
- else if (i > 0)
- sbuf.append("::");
- }
- else
- sbuf.append(':');
- if (x != 0 || i >= 14)
- sbuf.append(Integer.toHexString(x).toUpperCase());
- }
- }
- for ( ; ; )
- {
- sbuf.append(addr[i] & 0xFF);
- i++;
- if (i == len)
- break;
- sbuf.append('.');
- }
- return sbuf.toString();
- }
-
- public int hashCode()
- {
- // There hashing algorithm is not specified, but a simple experiment
- // shows that it is equal to the address, as a 32-bit big-endian integer.
- int hash = 0;
- int len = addr.length;
- int i = len > 4 ? len - 4 : 0;
- for ( ; i < len; i++)
- hash = (hash << 8) | (addr[i] & 0xFF);
- return hash;
- }
-
- public boolean equals (Object obj)
- {
- if (obj == null || ! (obj instanceof InetAddress))
- return false;
- // "The Java Class Libraries" 2nd edition says "If a machine has
- // multiple names instances of InetAddress for different name of
- // that same machine are not equal. This is because they have
- // different host names." This violates the description in the
- // JDK 1.2 API documentation. A little experiementation
- // shows that the latter is correct.
- byte[] addr1 = addr;
- byte[] addr2 = ((InetAddress) obj).addr;
- if (addr1.length != addr2.length)
- return false;
- for (int i = addr1.length; --i >= 0; )
- if (addr1[i] != addr2[i])
- return false;
- return true;
- }
-
- public String toString()
- {
- return getHostName()+'/'+getHostAddress();
- }
-
- /** If host is a valid numeric IP address, return the numeric address.
- * Otherwise, return null. */
- private static native byte[] aton (String host);
-
- private static native InetAddress[] lookup
- (String hostname, InetAddress addr, boolean all);
-
- public static InetAddress getByName (String host)
- throws UnknownHostException
- {
- if (host == null)
- return getLocalHost();
- byte[] address = aton(host);
- if (address != null)
- return new InetAddress(address, null);
- InetAddress iaddr = new InetAddress(null, host);
- lookup(host, iaddr, false);
- return iaddr;
- }
-
- public static InetAddress[] getAllByName (String host)
- throws UnknownHostException
- {
- byte[] address = aton(host);
- if (address != null)
- {
- InetAddress[] result = new InetAddress[1];
- result[0] = new InetAddress(address, null);
- return result;
- }
- return lookup(host, null, true);
- }
-
- static final byte[] zeros = {0,0,0,0};
- /* dummy InetAddress, used to bind socket to any (all) network interfaces */
- static final InetAddress ANY_IF = new InetAddress(zeros, null);
-
- private static final byte[] localhostAddress = { 127, 0, 0, 1 };
-
- private static native String getLocalHostname ();
-
- private static InetAddress localhost = null;
-
- public static InetAddress getLocalHost() throws UnknownHostException
- {
- SecurityManager s = System.getSecurityManager();
- // Experimentation shows that JDK1.2 does cache the result.
- // However, if there is a security manager, and the cached result
- // is other than "localhost", we need to check again.
- if (localhost == null
- || (s != null && localhost.addr != localhostAddress))
- getLocalHost(s);
- return localhost;
- }
-
- private static synchronized void getLocalHost(SecurityManager s)
- throws UnknownHostException
- {
- // Check the localhost cache again, now that we've synchronized.
- if (s == null && localhost != null)
- return;
- String hostname = getLocalHostname();
- if (s != null)
- {
- // "The Java Class Libraries" suggests that if the security
- // manager disallows getting the local host name, then
- // we use the loopback host.
- // However, the JDK 1.2 API claims to throw SecurityException,
- // which seems to suggest SecurityException is *not* caught.
- // In this case, experimentation shows that former is correct.
- try
- {
- // This is wrong, if the name returned from getLocalHostname()
- // is not a fully qualified name. FIXME.
- s.checkConnect(hostname, -1);
- }
- catch (SecurityException ex)
- {
- hostname = null;
- }
- }
- if (hostname != null)
- {
- try
- {
- localhost = new InetAddress(null, null);
- lookup(hostname, localhost, false);
- }
- catch (Exception ex)
- {
- }
- }
- if (localhost == null)
- localhost = new InetAddress (localhostAddress, "localhost");
- }
-}
projects / msp430-gcc.git / blobdiff